Group One Trading
MREO

Group One Trading’s Mereo BioPharma MREO Stock Holding History

Group One Trading’s Portfolio MREO Stock Details MREO Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$26K Sell
78,900
-73,500
-48% -$31.5K ﹤0.01% 5783
2025
Q4 		$63.5K Sell
152,400
-289,900
-66% -$552K ﹤0.01% 5393
2025
Q3 		$911K Sell
442,300
-47,600
-10% -$87.8K ﹤0.01% 3132
2025
Q2 		$1.33M Buy
489,900
+57,300
+13% +$138K ﹤0.01% 2503
2025
Q1 		$973K Sell
432,600
-261,800
-38% -$741K ﹤0.01% 2482
2024
Q4 		$2.43M Buy
694,400
+191,900
+38% +$754K 0.01% 1741
2024
Q3 		$2.07M Sell
502,500
-78,700
-14% -$326K 0.01% 1690
2024
Q2 		$2.09M Buy
581,200
+21,900
+4% +$70.9K 0.01% 1421
2024
Q1 		$1.85M Sell
559,300
-15,200
-3% -$51.5K 0.01% 1544
2023
Q4 		$1.33M Buy
574,500
+233,200
+68% +$446K ﹤0.01% 2200
2023
Q3 		$440K Buy
341,300
+92,300
+37% +$122K ﹤0.01% 3034
2023
Q2 		$329K Buy
249,000
+239,300
+2,467% +$278K ﹤0.01% 3444
2023
Q1 		$6.86K Sell
9,700
-19,300
-67% -$17.4K ﹤0.01% 6146
2022
Q4 		$21.8K Hold
29,000
– – ﹤0.01% 5549
2022
Q3 		$25K Buy
29,000
+16,700
+136% +$20.4K ﹤0.01% 5924
2022
Q2 		$14K Buy
12,300
+3,300
+37% +$2.56K ﹤0.01% 6562
2022
Q1 		$10K Buy
9,000
+1,500
+20% +$1.94K ﹤0.01% 7160
2021
Q4 		$12K Sell
7,500
-3,700
-33% -$7.4K ﹤0.01% 7277
2021
Q3 		$27K Sell
11,200
-19,900
-64% -$52.7K ﹤0.01% 6989
2021
Q2 		$99K Sell
31,100
-45,400
-59% -$152K ﹤0.01% 5969
2021
Q1 		$258K Buy
+76,500
New +$270K ﹤0.01% 4750

Other funds holding MREO

RCMNY
Rubric Capital Management (New York) New York $9.44B AUM 68.42% 1-Year Est. Return
EC
EcoR1 Capital San Francisco, California $2.36B AUM 204.53% 1-Year Est. Return
6CM
683 Capital Management New York $1.92B AUM 85.52% 1-Year Est. Return
Bank of America
Bank of America Charlotte, North Carolina $1.37T AUM 24.88% 1-Year Est. Return
DCM
Defilade Capital Management Emeryville, California $712M AUM
NM
Newtyn Management New York $936M AUM 27.23% 1-Year Est. Return
Millennium Management
Millennium Management New York $240B AUM 35.51% 1-Year Est. Return
TC
Tejara Capital London, United Kingdom $303M AUM 5.43% 1-Year Est. Return
UBS Group
UBS Group Zurich, Switzerland $666B AUM 30.12% 1-Year Est. Return
WANY
Wealthspire Advisors (New York) New York $12.7B AUM 17.31% 1-Year Est. Return

Group One Trading's MREO Position: Q1 2026 in Review

Group One Trading reduced its Mereo BioPharma (MREO) stake by 24% in Q1 2026, selling an estimated $45.4K and leaving 335,827 shares worth $111K. The position accounts for ﹤0.01% of the portfolio, ranked #4635.

Group One Trading first reported a position in MREO in Q2 2021 and has held it in 13 quarters since. The position peaked at $378K in Q2 2025. 63 funds tracked by Wall St. Rank hold MREO as of Q1 2026.

  • Group One Trading held 335,827 shares of Mereo BioPharma worth $111K as of Q1 2026.
  • Group One Trading sold 105,809 Mereo BioPharma shares in Q1 2026, an estimated $45.4K.
  • Mereo BioPharma made up ﹤0.01% of Group One Trading's portfolio in Q1 2026, its #4635 holding.
  • Group One Trading first reported a position in Mereo BioPharma in Q2 2021 and has held it in 13 quarters since.
  • Group One Trading's Mereo BioPharma position peaked at $378K in Q2 2025.
  • 63 funds tracked by Wall St. Rank held Mereo BioPharma as of Q1 2026.

Based on Group One Trading's 13F filing for Q1 2026, filed 13 May 2026.